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Community Ecology Study Guide Ch 7 test
1.What are the reasons the American alligator is now listed as threatened?
2. Ecosystem structure includes what aspects?
3.What does species richness refer to?
4.What does species evenness refer to?
5.Where is most of the world's biodiversity?
6.Species that normally live and thrive in a particular ecosystem are known as?
7.Species that serve as early warnings of environmental damage are called?
8.Species whose roles in an ecosystem are much more important than their abundance would suggest are called?
9.Species that migrate or are accidentally introduced into an ecosystem are called?
10.What characteristics make amphibians particularly sensitive to pollution?
11.Amphibians are important organisms because?
12.Sea otters, dung beetles, and gopher tortoises are generally considered to be what?
13.Species that can create and enhance habitats that can benefit other species in a community such as birds that regenerate deforested
areas and spread seeds through their droppings are called?
14.What are the reasons for the decline in shark populations?
15.What types of predators avoid competition by being active at different times?
16. What are several examples of adaptations acquired by organisms to detect food and mates?
17. omit
18.Predation is the obvious relationship demonstrated by a food chain (statement)
19.You are an evolutionary entomologist. You have observed beetles who can raise their abdomens and give off a defensive chemical
that generally repels predators. You discover a new species of beetle that raises its abdomen in a threatening way similar
to the first species, but no defensive chemical is given off. You are most likely to characterize this defensive strategy as a
form of what?
20.A relationship in which a member of one species obtains its nourishment by living on, in, or near a member of another species over
an extended time is best labeled as what?
21.A relationship in which one species benefits while the other is neither helped nor harmed to any significant degree is best labeled as
what?
22.A relationship in which both species benefit is best labeled as?
23.The relationship between clownfish and sea anemones is an example of what type of relationship?
24.How long does it take natural processes to produce fertile soil?
25.What is primary succession and give an example of where it would occur?
26.What is secondary succession and give an example of where it would occur?
27.Soil formation in primary succession is encouraged by what?
28.Describe a bit about immature ecosystems.
29.What is the intermediate disturbance hypothesis?
30.What is the ability of an organism to return to its former condition after a period of stress?
31.The ability of a living system to resist change is defined as?
32.The factor that likely poses the greatest threat of extinction of species worldwide is?
33.If wastewater treatment plants effluent that contains nitrates and phosphates is allowed to flow into a body of water, what could
result?
34.A state highway was constructed over wetlands. The state obtained a permit to fill the existing wetlands in accordance with the
provisions of the Clean Water Act of 1972, and agreed to create another wetland. This tradeoff approach to addressing an
environmental issue is known as?
35.What are two factors thought to be the most harmful to biodiversity?
36.Why do introduced species often become pests?